Variable-speed power-transmission mechanism.



` F. A. HAYES. VARIABLE lSPEED POWER TRANSMISSION MECHANISM.

Y APPLICATION Hifi() MAR. I2. 19l5-y F. A. HAYES. vAmABLE SPEED POWER TRANsMlSsmN MEcHANlsM.

' i APPLICATION FILED MAR. l2, 1915.

Patented June 5, 1917.

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' clear, and exact Pelham Manor,

and State of ANew York, have .invented cer-4 -f 'f A. HAYES, OF PELHAM MANOR, NEW YORK.

Specification of Letters Patent.

VIBLE-SPEED POWER-TRANSMISSION MECHANISM.

Patented aan@ a, ieri.

Serial No. 13,864.

To all 'whom t may concern.'

Be it known that l, 'FRANK A. HAYES, a citizenofl the United States, residing at in the county of Westchester tain new and useful Tmprovementslin Vanisms, Aof which the following is a full, description. This invention relates to Huid transmission mechanisms,particularly such as are used with motor vehicles. One obj ectY of the vinvention -is to providea mechanism of this character which when worlngat Anotherobject of has amaximum eliiciency theusual running speeds. the mvention 1s to eliminate4 all extraneous moving' parts' at full speed. A further object is to provide a fluidv transmission mechanism in which the normally operating parts thereof may at times act as a Huid clutch, Huid brake or self starter for the engine.

' Still' furtherobjects and advantages will lconnections which may be used for self-startrig. 1.

more fully appear from the detailed description and the features of noveltyin construction and combination of parts will be particularly pointed out in the claims.

lln the accompanying drawings,

Figure lis a sectional view illustrating diagrammatically one form of construction inwhich my invention may be carried out. VFigs. 2, 3 and 4 are sections taken respectively of Fi 1, loolng in the directions indicated y the arrows. f'

- Fig. 5 illustrates diagrammatically the ing. A v l Fig. 6 is a detailsectional view of the militer-crank adjusting mechanism, on line 6*(5 of Fig. 1. A a detail section on line 7 7 of rig. 7 is Fig.j Sis' a side view'of a part ofone of the valves, showing the passage by which two of the motors 'n be ley-passed.

. Fig, 9 isa dia ammatic view illustrating the operation .o lcertain valves.

fThe four cycle internal 'combustion enl and speeds and no be obtained.

along lines 2-2, 3-3 and 4-4,.

' creased torque ,uponA ginewhich is now vehiclesA 1s essentially and cannot start, or

run, at low speed, under' load. It is, thereore, necessary to provide a transmission gear through which the low, intermediate reverse speeds may be transmitted to the running wheels of the vehicle. The ordinary forms of transmission gear consisting of toothed gears are not entirely satisfactory for the reason that they transmit only fixed gradual increase of It has been proposed, there-l fore, to use a iuid transmission consisting of a pump driven by the engine and a, motor driven by 'the Huid pressure generated in the V pump, and means whereby per revolution of the'iiuid in the pump, or motor, or both pump and motor may be varied. This displacement is usually varied by adjusting the throw pump or motor, or by of the cranks of both pump and motor. Thus, when it is desired to start the vehicle from rest, the motor crank is adjusted to the maximum throw whilepthex pump crank is adjusted toV to supply to the motor the fluid required for one revolution, Athe pump has to rotate through several revolutions and thus the speed of the motor is considerably reduced below the speed of the pump and a lowY speed is conof theV lcrank of the sequently imparted to the vehicle. At thev same tune, however, a maximumtorque Vor tractive eliort is exerted at suchlow speedby reason of the large displacement of :fluid per revolution of the motor as compared with the pump; or, looking at it from another point of view,

in common use on motor adjusting the throw minimum throw. In order.

for application Serial No.'754,798, filed March'l?, 1913. This application iiled. March 12, 17.915.

speed can the displacement jV the motor exerts aninthe transmlsslonshaft by reason -of the large throw otits cranlr\9o as compared with the throw of the pump crank. f

This form of transmission is ideal in the sense that an indefinite number of speeds may be obtained ranging from rest up to of the engine or eventhe maximum speed higher speeds, although the'latter are generally not desirable. Also the .vehicle may to the other side of the shaft axis. However, the difficulty with this transmission is that -at the maximum speed of the vehicle both the motor and pump are working at maxlmum speed, and therefore, the motor and pump losses are ata maximum at that time,

I vof my invention in Figs. 1 to 6, as

.2 of the engme consequently detracting from the eiciency of the transmission. f Moreover, the constant wear materially shortensthe life of the apparatus.

To overcome this difficulty, I have provided a fluid transmission in which the pump is so connected with respect to the engine shaft and transmission shaft that at low speeds it pumps the fluid to-the motor substantially in the same manner as in the type of-V uid transmission above described, obtaining thev high torque desirable at such speeds. However, at all forward speeds, the pump itself exertsa direct torque upon the transmission shaft in addition to the torque of the motor. Moreover, when itis desired to drive the vehicle at high speed,- the pump may be coupled directly tothe transmlssion shaft, so as to act as a uid clutch while `the motor crank may be adjusted to no-throw position, thus practically putting the pump and motor out of operation at such speed of the vehicle, and obtaining a direct positive drive without any relative motion of the transmitting elements. I have also provided additional means whereby the speed of the motor may be increasedfby cutting out of operation some of the motor cylinders. Thus in orderto maintain the same rate of displacement withfewer cylinders in operation the number of revolutions per minute of the motor must increase. n

Referring to the diagrammatic illustration applied to a four cylinder motor and pump, the shaft 1 is keyed or otherwise positively coupled to the cylinder casing 3 of the pump. The latter carries lopposed cylinders 4, 51 6 and 7 in which jwork pistons 8 con- 10 of the transmission shaft 11. The crank preferably has a constant throw; however, it may be arranged for vvariable throw without departing from my invention. 'lhe ends of the opposed cylinders 4 and 5 are connectedthrough passages 12 and-13 with a rmg 14, and the opposed cylinders 6 and 7 are similarly connected with the ring 14 through passages 15 and 16. The ring is loosely mounted with a snug fit upon a drum 18 which is keyed or .otherwise secured .to the'l transmissionv shaft 11. Suitable ports are formed in the ring and drum for .transmitting respectively .pressure and suction to two stationary rings 19 and 20 a1so mounted upon. the drum` andconnected by ducts 21 and 22 to the casing 23 of a controlling points, for a purpose hereinafter to be de-A scribed.

I have illustrated the ring 14 as formed with two ports 12a', .13, diametrically opposite each other and communicating respectively with the ducts 12 and 13. The drum 18 is formed with two compartments or vchambers 28 and 29 separated by a web or partition wall 30. DlametricallyI opposed circumferential slots 31 and 32 are formed in the periphery of the drum, the upper of which, in the position illustratedv in Figs. 1l

and .2, communicates pressure' to the compartment 28 and the lower aperture or slot 32 transmits suction through the compartment 29. The ports 15a, 16, in the-ring 14 are'midway between the ports 12a, 13a, to correspond with the disposition of the cylinders 6 and 7 with which said ports 15, 16, communicate through the ducts 15, 16.' The .compartments 28 and 29 are provided with suitable outlets 39 and 40 spaced longitudinally with reference to each other, so as to communicate with the rings 19 and 20. The latter are formed with continuous circumferential passages 41'and,.42 completely encircling the drumas clearly lappears from Fig. 3. It will thus beseen that when the cylinder casing 3 is rotated in the direction of the arrow (Figs. 2 and 3) at a higher speed tion will be transmitted to the duct 22 and pressure will be transmitted to the duct 21.

than the transmission shaft 11, suc- I This pressure and suction of the pump may be transmitted to the motor through the following connections: A rotary valve plug 43 is mounted in the valve 'casing 23, and has passages 44,- 45 and 46 extending therethrough. The extremities of the passage 44 and likewise thek extremities of the passage 46 are spaced 90 on the periphery of the valve plug, whereas the passage 45 extends diametrically through the same. When the valve plug is turned 45 to the right, to the position indicated in dotted lines, the duct 21 communicates with a'duct 48 and the duct 22 communicates with a duct 47, both these ducts 47 and 48 'being disposed preferably at diametrically opposite points about the valve casing 23 and 90 from the ducts lead- 'inggto the pump valve. The motor valve consists of a drum 49` similar in construc-A 4 formed in the periphery of the drum 49 with the compartments or chambers 56 and 57'v .into which this drum is divided by a web or partition wall 49a. A

' Lezama For conveying-the pressure and suction from the compartments 57 and 56 of the,

yalve drum 49, the periphery of thelatter 1s pierced to form diametrically opposed circumferential outlet apertures or slots 58 and 59 to communicate with ports in a ring 60. This ring is substantially of the same-construction as the ring 14 of the pump valve.

Thus the ring 60 (Fig. 4) is Vformed with two ports 64 and 65, leading through ducts `68`and 69 to two-of the motor cylinders, and with intermediate ports 70 and 71 leading to the motor cylinders 88, 89, through ducts 74 and 75. Y I have provided means for by-passing two of the cylinders, for example two of the motor cylinders, so as to ,decrease the displacement of the motor per revolution and thus increase its speed. 'This means may lconsist ofa sleeve 7 6 slidable upon the drum but feathered to the ring 60, as by a feather 77. This sleeve isformed with narrow diametrically opposed perforations 78 and 79 (Figs. 1 and 4) registering with the ports 64, in the ring 60 and is provided also 'tering with the ports 70, 71, of the ring. he sleeve -is provided with a peripheral channel 82, Figs. 1 4, 7 andS, which at the 3@ top passes `under the feather 77 but elsewhere .is in the outer surface of the sleeve. At the top and bottom the passage 82 lies alongside of and to the left of the ports 80, 80a, 81,. 81, but it is curved or offset, as indicated in Figs.- 1 and 8, into proximityto the narrow ports 78, 79, lwhich normally (that is, when the sleeve is at its leftward position, as in Fig 1) register with ports 64, 65, as in Fig. 4. vThe sleeve vis feathered to the stationary drum 49, but may be shifted axially (toward the right in Fig. l) by any suitable means, notshown connected with the flange 85,

- thereby shifting the ports 78- and 79 out of 475 register with the slots 58, 59 ,`in the drum 49, and ports 64,165 in the ring 60, and lbringl l mg the curved or oifsetportions, as82, Fig. 8, of the passage 82, into register withsaid a -ports64, 65. The ducts 68 and .69 are thus .'50- broughtinto communicationpassage 82 and the opposed cylinders ofthe through the pump. While the sleeve is so shifted, the

u-E'fiaXiellyelongatedportsor slots 80. and 819, alongside o 'ports 80 and 81 respectively, always permit -slots u1158 and 5 9 off-.the drum and the ports 70,71, in the ring-60.-

f The motor is/of, substantially the same construction'as the-pump, but its casing 86 is 6.5 fixed in any suitable manner, as by bolts v87,

with perforations or slots 8O and 81 regisv nected by a pin lOl-to a block 101a ring 60 so as;` not to rotate with the valve.

motor that are connected withsaidfducts are; i -accordingly bypassed; That is, .luid dis! laced f rom'one cylinder simply flows, into neither re-l previously described.. Thismovemen@ the "valve -is continued so as to @admit morei V'and communication through the to some suitable stationary support, not shown. The pressure and suction are transmitted through the ducts 68, 69, 74, .75 above described to the opposed motor cylinders 88, 89, etc., in which reciprocate the pistons connected by connecting rods 91 to an adjustable crank 92 mission shaft.

Ang suitable mechanism may be employed for a justing the motor crank. I have'illusmounted upon the trans- 'trated this crank in the'form of a slidable 'U mounted on guides formed by transverse arms 93 'and 94 which' extend from the trans# mission shaft l11 and from an extension 11a thereof.V Loosely mounted upon the transmission shaft adjacent to` the crank is a sleeve 95 having a spiral groove 96 formed on its periphery. A second sleeve 97, feathered to the thrust collar 97a on the shaft 1l, is mounted upon the sleeve 95 and is providedv with a pin 98 engaging the groove 96 in sleeve 95. A collar 99 is mounted in a groove in the sleeve 97 by which collar the sleeve 97 may be shifted longitudinally.A Such a shift causesthe sleeve 95 to rotate with reference to the transmission shaft. Through the medium of the' arm 100, con- (Fig. 6) slidably engagmga slot in the'side of the crank 92, the described rotation of thesleeve 95 adjusts the crank'toward and from the axis of the shaft so as to diminish orincrease its throw,.as the case may be. When the vehicle is at rest, and'al'so at the lowest forward speeds, the motoricr'ank '100 92 is adjusted to its maximum throwand f "the sleeve 76 is at its leftward positie l so as i motor at this time acting as ali vsurge back and forth betweliltsgcyh-n .To start the' vehicle forward, 'efil-lv plug f43 is ,turned slightly-5to the? aubwi'ng ,the rest ofthe anidto by-'a leading to the motor cylinders. `Similarly pressure is exerted through the rotary valve 18, the duct 21, passage 46 in the valve plug,

duct 48, through the chamber 57 of the rotary valve 49, and then transmitted alternately through the` ducts 68, 69, 74 and 75 to the corresponding motor cylinders. The vehicle is then driven at low speed, the speed ratio depending upon the relative throws of the pump and motor cranks, and upon the relative piston areas of the pump and motor. j

To increase the lspeed of the motor the throw of the crank is decreased to any suitable practical limit and then .a certain number of motor cylinders may be by-passed, as by shifting the sleeve y76, as previously de'- scribed.

To'drive at full speed, the valve plug 43 is adjusted at right angles to the position illustrated inv Fig. 1. In such position, the motor is by-passed and the pump is choked, thus positively coupling the latteryto the transmission shaft and the motor being then driven as a pump to idly circulate the huid between its cylinders. The crank 92 may then be further adjusted to nog-throw position, whereupon the moving parts on the motor are rendered stationary and the transmission shaft is driven from the motor with a positive direct drive without causing any j idle motionof extraneous parts.

For'reverse drive, the valve plug 43 is adjusted to a position at 45 to the left (counterclockwise) from that shown in full lines in Fig. 1'. This changes the duct 48 to the suction duct and the duct 47 to the pressure duct, thus reversing the operation of the motor valve and thereby reversing the f motor.

In a practical construction, the motor crank may be readily adjusted from twice the throw yof the pump crank down to a position of no-throw. When the valve is at 450 as above assumed, the motor will be driven at speeds varying from one-third of the engine speed with the former adjustment clear up to full engi-ne speed with the per minute Y (1) VR :R because all fluid which passe through pump passes through motor.

(2) R :D (N-N) because the elfective pumpingl revolutions are those in excess of revolutions of transmission shaft. (s) n :D'N'

In view of (1) DNzD (N-N) If we assume that the pump and motor have the same number of cylinders and equal piston area-s, the displacements of the pump and motor will be proportional to the throw of their respective cranks. Therefore. if the maximum throw of the motor crank is twice the throw of the pump crank, D equals 2D. Substituting this value of D in equation (4), we get N equals ()N for low speed.

If the throw of the motor crankis then decreased until it equals the throw o f the pump crank, then D equals D and substituting this value of D in equation (4) we get N equals (50N or half speed for this adjustment of the motor crank. Whenthe crank is adjusted to a position of no-throw, N equals N, or in otherwords, the transmission shaft is drivenl at the same speed with the engine.

\ To further v-ary the speed some of the cylinders of the motor can be cut out, and by-passed by means of, the sliding sleeve above described. Thus if desired Jthe piston area of the motor may be'made one-half the piston area of the pump.

The speed may also be varied by varying the'v cut-oft' of the motor or the pump and ,the motor, in conjunction with or independ-I ently of adjustment of the motor crank. This will be readily understood when it is remembered that the pistons 90 are reci rocated (to impart rotation tothe shaft 11 by fluid delivered through pipes 68, 75, 69, 74, in succession. Referring to Fig. 4, it will be seen that iiuid will be delivered from chamber 56 through ports 59, 8l, and 7l, to pipe 75, so long as port 59 is in register with port 81, and that iuid will be discharged from pipe 74` through port 58 as long as it is in registerwith port 80. If now we shorten f (in circumferential extent) the slots or ports 58, 59, Fig. 4, it is clear that the flow of fluid through pipes 75, 74, will be cut yolf earlier (or begin to flow later) in the cycle.l This will reduce the displaoement-that is, the volume of fluid moved-by vthe motor and hence the speed will be increased according to formula (4) above. This earlier cut-off can besecured by inclining one side of the :circumferential slots or ports 58, 59,

for example as indicated in Eig. v9, which aforesaid ports can and reach and at the same time leave suiiireadily understood.

varies the time of cut oii'.

ofthe ratio of the portional-v to.` the maaar@ kshown in full lines, with the slot 58 moving upward (in the direction of the arrow) the 5 port 80 will notl be closed until the lower. end

of slot 58 has passed it., But if we move slot 58 rightwardly to thevposition shown in dotted lines the port 80 will be closed by that. part of the inclined edge-lying between 10 lines m, p, some time before the Vlowerzeud of the slot reaches the position of port 80. If

the slot is the port 80 will be closed still earlier in the cycle, by the part of the inclined edge above 15 line p.' For this purpose the cliambered cylinders 18, 49' are capable of limited sliding.

movement on the transmission shaft 11, andl one side of each of the ports 31, 32, 58, 59 is inclined as indicated. In the arrangement 20 shown, the partition walls 30 and 49a, which divide the,I cylinders into chambers or com-v Vpartment'f; are skewed in a helical fashion nearf'or at one end of each,so that the have the necessary width cient space between ports 31 and 32, and between ports 58 and 59, to close ports 12, 13a, 15, 16a (Fig. 2), and ports 78, 79, 80, 81 (Fig. 4), at the proper instants, as will be cylinders axially, thereby bringing the inclined sides of the revolving ports more and more into, or more and more out of, the planes of the respective stationary ports, This has, practically, the effect of varying the relative displacements of the pump and motor, thereby producing a change o f speed since, as explamed above'the s eed is a function ump splacement tothe sum of the two dlsplacements. In .general it is' suiiicient to vary the cutoiof the motor alone,

ng the: valve cylinde levers v 18, 49h, connected vices (not shown)iat` any -Qs ient for the operator, z The relativettorque of 'they motor and ition conven- 50 pump' exerted upon .the transmission shaft is proportional .to the respective displacements of the motor and pump, inasmuch as the Huid pressure is the same forl both. This torque will', with equal piston areas, be prothrow of the motor and pump cranks. Thus, K when the throw of the' motor crank is twice the throw ofthe pump crank, the torque of the motor vwill be twice thetorque of the 60 pump, and, therefore, twice the torque ofthe engine; and at half' speed, when the throw of the motor crank is equal to the throw of the pump crank, the torques will also be equal. The torque on the transmission shaft is, however, the sum of these two moved still fartherl to the right I lever,

Evidently. shifting thev will operate as (Fig.

ylng to exhaust,.and. the

.and'107 connected by a but both can bevarifed if desired.

An suitable means can-,bel provided for 45 shiflti rsas for example f actuating de-v` for control by the operator.

' at onethird speed,

It will be'noted that my improved fluid A transmission mechanism takes the placeof and includes in its functions that of a clutch, brake and change-speed gear. auxiliary supply of compressed fluid, the

By using an pump may be operated as a motor for start- A ing the engine. Thus the function of 'selfstarter may be combined with the other .properties of my improved transmission mechanism. All of the adjustments of the transmission as well as the connections for may be controlled by a single control lever, and, if desired, the throttle of the engine may also be connected to this thus simplifying the entire control of the vehicle substantially to one operating lever. This will be'readily understood by those skilled in the art.

In Fig. -5 I have illustrated diagrammatically connections which may be used for adapting the pump to actl as a self-starter forv the engine. While the transmission shaft is held stationaiyby the choking of the motor, vit will be Aevident that, should pressure be supplied to thel duct 22, and,

the duct. 21 be opened to exhaust, the pump Forthis purpose, three way valves 102 and 103 may bel formed in the ducts 21 and 22 for'sel y valve 103 leading by a duct 104 into a'source of iiuid pressureas a storage tank 105, asin Fig.` 5, which' shows the 'positions of thefyalves when the engine is being` started. A`These le'ratedF simultaneouslyv through levers 106 link 109 whichis in turn connected by a rod 108 and any suitable further connection Stops 110 may berprovi'ded for limiting the movementjof 'fthe valve leversso as to bring them tofftha desired adjustment. The link 108 has' a slet 108a for the pin in l spring 108? to hold the lever yieldingly at the left end of the slot, as shown, but pera motor to start the engine.-

valves maybe op-V l a valve4 lever 107, withA la 5); the valve 102, ,in the adjustment -starting illustrated in Fig..5, opento a convenient position pendently of valve 103` for the purpose hereas soon as the engine lis started the-valves 102, 103 are both-v turned- 90 the clockwise direction.

afterA explained. It will-Vibe understood that* The pressure tank 105 may,"if desired, be l replenished bythe when the engine is vehicle is stationary. This maybe accompump .during `the time .running free' and. the

plished by connecting thepressure duct 21l l through ai passager 11.1 with the pressure source of fluid supply.' Three way valves 115" mittingv manipulation of valve 102 indeconnected by rod 117 and link 118 to some suitable control device to be manipulated -by the chauffeur. Normally the valves 113 and 114 are adjusted so as to alloW freel passage Within the ducts 21 4and 22 tothe control valve 23 and interrupting communication with the pressure tank and the source of iuid supply. However, when it is desired 'to charge the tank, these valves 113 and 114 are adjusted so as to close ofi' the ducts 21 and 22 from the valve 23 and open them respectively to the pressure tank and the source' of fluid supply as above indicated. l

When using a gaseous yiiuid (usually air) as the energy-transmitting medium, I prefer "to have the pressure on low-pressure side of the system higher than atmospheric, as Well as on `the.high-pressure side, as it is thus possible to approximate the advantages of a liquid medium Without its disadvantage of lpractically 'total laclv of compressibility. The compressed gas needed can be drawn from the storage tank 105. For this purpose it is only necessary to have the valve 102 inthe running position (90 clockwise from the position shown in Fig. 5), While the valve 103 is in the position shown, the ducts 111A and 112 being closed, the valve plug 43 in thedotted line position, and the engine running. This manipulation of valve 102 Without actuating valve 103 is effected by leftward movement of rod 108 While rod 108, connected to arm 107, is held; such leftward movement of rod 108 being permitted by the yielding of spring 108". When suflicient fcompressed gas has been let intov the system, the valve 103 is restored to running position,`90o clockwise from the position shown.

It Will bevunderstood that-the construc- "tions, combination of parts, and mode of i operation, above described, are merely illustrative of my invention., I do not wish i to limit myself, therefore, to the specific embodiments herein described; as many changes in such construction, combination of parts and mode of connection Will occur.

course, that the apparatus may bef-driven from either-end. l

' Having thus Adescribed claim:

1. In a iuid transmission.mechanism, a

my invention, I

i driving shaft, a transmission shaft, a pump comprising two relatively movable elements,

one of said-elements being connected to the driving shaft and the other` of said elements being connectedy to the transmission shaft,I

a motor comprising a stationary elementv and a relatively movablel element, said movable element being operatively connected to l transmissionk shaft, a stationary motor casing, an element Working in said motor casing also connected to the transmission shaft,

and valve mechanism for conducting the fluid from the pump to the motor.

`3. A iluid transmission mechanism comprising a driving shaft, a pump casing coupled thereto provided With radial cylinders, a transmission shaft having a crank, pistons Working in the pump cylinders connected to the crank, a stationary motor casing provided with radial cylinders, a second crank on the transmission shaft, pistons Working in the motor cylinders connected to said second crank, and valve mechanism for conducting the fluid from the pump to the motor.

4. A Huid transmission mechanism comprising-a driving shaft, a pump casing coupled thereto, provided with cylinders, a transmission shaft having a crank, pistons Working in the pump cylinders connected to the crank, a stationary motor casing provided With cylinders, an adjustable crank on the transmission shaft, pistons working in the motor cylinders connected to said adjustable crank, and valve mechanism for con- .ducting the liuid from the pump to the motor.

5. A fluid transmission mechanism comprising a driving shaft, a pump casing coupled thereto, provided with cylinders, a transmission shaft having a crank, pistons Working in the pumpl cylinders connected to vthe crank, a stationary motor casing provided With cylinders, a second crank on the transmission shaft, pistons Working in the motor cylinders connected to said second crank, valve mechanism for conducting the fluid from the pump to the motor, and 'means for cutting out of the fluid circuit some of the cylinders.4

6. A fluid transmission mechanism comprising -a driving shaft, a pump casing coupled thereto, a transmission shaft having a crank, pistons' Working in the pump cylinders connected to the crank, a stationary motor casing provided with cylinders, an adjustable crank on, the transmission shaft, pistons Working in the motory cylinders con'- out of Ithe liuid circuit some of the cylinders.

7. A liuid transmission mechanism comprismg a driving shaft, a pump casing counected to said adjustable crank, valve mech- 4anism for conducting the iuid from the 'pump to the motor, and means for cutting pled thereto, provided -with cylinders, a

transmission shaft having a^crank, pistons Working in the pump cylinders connected to ment by-passin the crank, a stationary motor casing provided With cylinders, transmission shaft, pistons working in the motor cylinders connected to said second crank, valve mechanism for conducting the fluid from 4the pump to the motor, and

means for cutting out 4of the fluid circuit a pair of opposing cylinders and also by-passing the same. A

8. In a fluid transmission mechanism, a driving shaft, a transmission shaft, a pump comprising two relatively movable elements, one of said elements being connected to the driving shaft and the other of said elements being connected to the transmission shaft', a Y 'motor comprising a stationary element and a relatively movable element, said movable elebeing operatively connected to the transmission shaft, .and valve mechanism 'for conducting the iuid from the pump to the motor and for choking the Apump to directly couple` the"driving and transmission shafts together.

9. In a fluid transmissionmechanism, a

driving shaft, a transmissionfshaft, a pump comprising two relatively movable elements,

one of said elements being connected to the driving shaft and the other of'said elements being connected to the transmission shaft, a motor comprising a stationary element and p justable crank, valve mechanism for` con-`- ducting the fluid from the pump tothe motor, means foradjusting the adjustable crank to no-throw position, and means for Achoking the pump to positively couple the driving and transmission shafts. 1 11. A fluid transmission mechanism com? prising a driving shaft working in the pump cylinders connected to the crank, a stationary motor casing provided vvith cylinders, an adjustable crankl on the transmissionA shaft, pistons working in the motor cylinders connected to said adjustable vcrank,.valve Amechanism for conducting the fluid from the pump to the motor, means `for adjusting the adjustable l F .l .n l

a second crank on the a pump casing cou-f 7 pled thereto, provided with cylinders, a E transmission sha'ft having a crank, pistonsfv crank to no-throw position, and v.means for choking the pump and by-passing the ,ino-

tor.

12. A fluid transmission mechanism comprising a driving shaft, a pump casing coupled thereto and rovided with cylinders, a transmission shaii?, having a crank, pistons working in the pump cylinders-andconnected to the crank, astationary motor casing providedwith cylinders, afsecond crank on the transmission shaft, pistons Working in the motor cylinders and connected to-said second crank, and valve mechanism for conducting the fluid fromthe pump to the motor and operable at will to choke the motor and by-pass the pump.

13. In a fluid transmission mechanism, a driving shaft, a transmission shaft, a pump comprising two relatively movable elements, one of said elements beingl connected to the driving shaft and the other of said elements being connected to the transmission shaft, a motor comprising a stationary said movable element being operatively *connected to the transmission shaft,a rotary valve for the pump, a rotary valve for the element and a relatively movable element,

motor, and controlling means disposed between said valves. y, 14. In a fluid transmission mechanism, a

driving shaft, a transmission shaft, a pump comprising two 'relatively movable elements, one of saidelements being connected i Vto the driving shaft and the other of said elements being connected to the transmiselement and ,a relatively movable element, said movable element being operatively connected to the transmission shaft, valve mechanisms for the pump and motor, and controlling means disposed between said valve mechanlsms for reversing the fluid pressure transmitted 'to the motor.

15. A fluid' transmission mechanism comprising a driving shaft, a. pump casing coupledv thereto provided with cylinders, a transmission shaft Shaving a crank, pistons working in `the pump cylinders connected. vto the crank, a stationary motor casing pro` vided with cylinders, a second crank-on the transmission shaft, pistons working inthe ',sion'shaft, a motor comprising a stationary motor cylinders connected to said secondv crank, arrotary valve for the pump, a rotary valve for the motor, and means between said valves for reversing the -flow of fluid from the pump to the motor.

'16. A Huid transmission mechanism comprising a driving shaft,.a pump casing coupled thereto provided. with cylinders, a transmission shaft having a crank, pistons 'working in the pump vcylinders connected to the crank, a stationary motor casing prov.

videdwith cylinders, a second crank on `thetransmission shaft, pistons working 1n motor cylinders connected toi said second crank, a chambered member revolving in harmony with the transmission shaft, ducts leading from theA pump cylinders to said chambered member and communicating alternately with the respective chambers, means for conducting pressure andvsuction from said chambers comprising a controlling valve, and means forv communicating the pressure and suction to the motor cyl'- inders.

17. A fluid transmission mechanism comprising a driving shaft, a pump casing coupled thereto provided with cylinders, ,a

` transmission shaft having a crank, pistons working in the pump cylinders connected to the crank, a stationary motor casing provided with cylinders, a second crank on the `transmission shaft, pistons working in the motor cylinders connected to` said second crank, a chambered member revolving in harmony'with the transmission shaft, ducts4 leading from the pumpv cylinders to said chambered member and communicatin alternately with the respective cham ers,

means for conducting pressure and suction from said chambers comprising a controlling valve, a second chambered member mounted upon the,transmission shaft and connected with said liuid transmitting means, and ducts leading vfrom the motor cylinders .communicating alternately with the chambers of the second chambered member,

18. A fluid transmission mechanism comprising a driving shaft, a pump casing coupled thereto provided with cylinders, a transmission shaft having a crank, pistons working ih the pump cylinders connected to the crank, a stationary motorcasing provided with cylinders, a second crank on the4 transmission shat,'pistons working in the motorcyllnders connected to said second crank, a chambered member revolving in harmony with vthe transmission shaft, ducts leading from the pump cylinders to said chambered member and communicating alternatel with the respective chambers, means or conducting pressure and suction from said chambers comprising a controlling valve, a second chambered member mounted upon the transmissionshaft and means, ducts leading from the motorcylinff' ,ders communicating alternately. with the connected with said uid transmitting chambers of thesecond chambered member, a shiftable sleeve between -'the motor ducts .andthe said second chambered member, said sleeve provided with apertures for permitsting communication between theducts and chambers and provided also with achannel for by-p'assing certain of the motorcylinders.4

Aiiuid transmission mechanism comprising a driving shaft,.a pump casing coupled theretol provided cylinders, a transmission shaft having a crank, pistons Working in the pump cylinders connected to the crank, a stationary motor casing provided with cylinders, a second crank on the transmission shaft, pistons working in the motor-cylinders connected to said second crank, a rotary valve for the pump, a rotary valve `for the motor, connections between said valves comprising a controlling Y valve, the latter valve including a casing intoV which the ductsfromA the pump and motor valves lead, and a valve plugin the casing having passages therein for communicating thepressure and suction from, the

pressure and suction ductsleading from thev pump valve to ducts leading to the motor valve, said plug having also apassage for by-pa'ssing the Vducts leading. to the motor f valve. ,y

20. A fluid transmlssionmechanism comprising a driving shaft, a, pump casing coupled thereto provided with cylinders, a transmission shaftu having a crank, pistons working in the pump cylinders connected to the crank, a stationary motor casing provided with cylinders, a second crank on they transmission shaft, pistons working in 'the motor cylinders connected to said second crank, a rotary valve for 'the pump, a rotary' valve for 'the motor, connections between said valves comprlsing a controlhng valve, the latter valve including a casing c into which the ducts from the pump motor valves lead, and a valve plug 1n the casing having passages therein for communicating the pressure and suction from the pressure and suction ducts leadingv from the pump yvalve to ducts leading to the motorvalve, said plug having also a passage for ley-passing the ducts leading to the motor.

valve, in one osition of adjustment and bypassin the ucts leading from the` pump valve 1nl another position of the plug.

' 21. A fluid transmission mechanism comprising a driving shaft, a pump casing couanda lodo

pled thereto provided with cylinders, aA

transmission shaft having a crank, pistons working in the pump cylinders connected to the crank, a stationary motor casing provided with cylinders, a '.second crank on the transmission shaft, plstons working m fthe motor .cylinders connected to said second crank, a rotary valve for the pump, a.

rotary valvel for the motor, connections bev tween said valves comprising a controlling- 1n one position of adjustment and the mo-l tor ducts in another position of adjustment.

22. A Huid transmission mechanism comprising an engine shaft, a transmission shaft, a pump e ement driven by the engine shaft, a coperating pump element connected'to the transmission shaft, a motor connected to the transmission shaft, means for conducting the iiuid from the pump to the motor, means for holding the transmission shaft stationary, and means for supplying fluid pressure to the pump to start the engme.

A fluid transmission mechanism comj prising an engine shaft, a transmission shaft, a pump element driven by the engine shaft, a coperating pump element connected to the transmission shaft, a motor connected to the transmission shaft, means for conducting the iuid from the pump to the motor, means for choking the motor to hold the transmission shaft stationary, a source of4 fluid pressure, connections from said source `for supplying pressure to the pump to start the engine, and connections from the pump to said source of pressure for charging the latter. l 4

24. In a fluid transmission mechanism, a driving shaft, a transmission shaft, a pump comprising two relatively movable elements, one connected tothe driving shaft and the other to the transmission shaft, a motor..

comprising a stationary element and a relatively movable element, the latter element being operatively connected to the transmisslon shaft, and valve mechanism for conducting iuid from the pump to the motor, said valve mechanism including means for varying the cut-off of the motor to vary the speed thereof.

' 25. In a iuid transmission, a driving shaft, a pump casing coupled thereto, a transmission shaft, an element Working in the pump casing and connected to the transmission shaft, a stationary motor casing, an element working in the motor casing and also connected with the transmission shaft, and valve mechanism for conduct-ing iuid from the pump to thev motor, said valve mechanism including means for varying the' cut-of of the motor to vary ithe speed thereof.

l 26. A fluid transmission mechanism comprising a driving shaft, a pump casing coupled thereto and rovidedwith cylin ers, a transmission sha having a crank, ypistons working in the pump cylinders and connected to the crank, a stationary motor casing provided with cylinders, an adjustable crank on the transmission shaft, means for adjusting the crank to vary its throw, pistons `tively connected with valve-mechanism for the of a gaseousmedium between Working in the motor cylinders and conneeted with the adjustable crank, and valve mechanism for conducting fluid from the pump to the motor, said valve mechanism including means for`varying the cut-ofi'l of the motor cylinders.

27. In a'iiuid transmission mechanism, a driving shaft, a transmission shaft, a pump comprising two relatively movable'elements,

' one connected to the driving shaft and the other to the transmission shaft, a motor comprising a stationary element and a relatively movable element the latter element being connected to the transmission shaft, valve mechanism for conducting iiuid from the pump to the motor and including a motor-valve having a relatively stationary part provided with ports and a relatively shiftable part rotating in harmony with the transmission shaft and having ports adapt ed to register successively withthe ports in said stationary part, and means for shifting the shiftable part to vary the cut-off of the motor.

28. In a fluid transmission mechanism, a driving shaft, a transmission shaft, a pump comprising two relatively movable elements one connected to the driving shaft and the other to the transmission shaft, a motor comprising a stationary element and a relatively movable element, the latter element being connected to the transmission shaft, and

valve mechanism for conducting fluid from the pump to the motor, said valve mechanism including means for varying the cutoii" of the pump and of the motor.

29. In a fluid transmission mechanism,'a driving shaft, a pump casing coupled thereto and provided with cylinders, a transmission shaft having a crank, pistons working in the pump cylinders and operatively connected with the crank, a stationary motor casing provided with cylinders, a second crank on the transmission shaft, pistons working in the motor-cylinders and operathe said second crank, the pump, and rotary motor, connected with the pump valve-mechanism and having a part shiftable at will to vary the cut-off of the motor.

30. In a fluid transmission mechanism, a driving shaft, a pump having a movable element driven 4by the driving shaft, a motor having cylinders, connections between the pump and-the motor cylinders for the fiow the two, pistons working in the motor cylinders, a transmission shaft operatively connected with the valve-mechanism for pistons, and a motor-valve in the aforesaid having tWo relatively movable elements oneJ pressure higher than atmospheric on both connected With the driving shaft for actuathe low-pressure and the high-pressure sides tion thereby and the other with the transof the system. mission shaft, a fluid-pressure motor having In testimony whereof I aiiix my signature 5 abtatonary elemlent amll a relatively movin the presence of two subscribing Witnesses. 15

a e e ement t ie atter e ement eing operatively connecited With the transmission shaft, FRANK A HAYES' valve mechanism between pump and the Witnesses: motor, and a gaseous energy-transmitting M. LAWSON DYER,

10 medium filling the system and having a A S. S. DUNHAM. 

